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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e571f80786f340896418410b7e7dbf333329c836d6f46b56e2514f6f7871fd6' 
  AND token = 'CWHNcySoPh6tRL8qMOfRfGRGouD/8v3oGej02KK2waU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}